St. Louis County, Minnesota · Frost dates
St. Louis County frost dates.
First-frost, last-frost, and growing-season length for St. Louis County, Minnesota. Sourced from NOAA 1991-2020 Climate Normals.
Data confidence: high · USDA zone: 4a
32°F — light freeze
Last spring frost
- 10%
- 05-28
- 20%
- 05-23
- 50%
- 05-12
- 80%
- 05-04
- 90%
- 04-30
First fall frost
- 10%
- 09-18
- 20%
- 09-23
- 50%
- 10-01
- 80%
- 10-09
- 90%
- 10-14
28°F — killing freeze
Last spring freeze
- 10%
- 05-16
- 20%
- 05-11
- 50%
- 05-03
- 80%
- 04-25
- 90%
- 04-20
First fall freeze
- 10%
- 09-29
- 20%
- 10-02
- 50%
- 10-13
- 80%
- 10-22
- 90%
- 10-27
Growing season length (days, 28°F threshold)
- Short year
- 136
- Median
- 163
- Long year
- 190
Source NOAA station
EVELETH WWTP, MN US
8.4 mi · 30 yrs of record (1991–2020) · 1445 ft elev.
Data from EVELETH WWTP, MN US, 8.4 miles away with 30-year NOAA record (1991-2020).
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